Unit Gas

is 1kw just 1 unit - Gas and electricity.. ?

The unit used for measuring electricity consumption is the kilowatt - hour. (KWH) i.e 1 kilowatt used for a period of 1 hour.
Gas is usually measured in cubic metres and to convert the reading on your gas meter to kilowatt - hours multiply by 10.84. (This figure depends on the calorific value of the gas but this is a good average to use) i.e. 1 cubic meter of gas is equivalent to 10.84 KWH